guys i'm developer on galaxy mega 6.2 gti9205.. i found a simple mod to fix this bug on all phones with 240dpi..
i port s5 to gti 9205 and me too have 240 dpi default samsung. and them make bu keyboar,diall,contact, keypad,calculator.launcher..
SOLUTION: open files build.pop on rom flashable. and change dpi 240 to 320... work fine. no bug. and fix all